3DsMax's Optimize tool in Blender
So ,You have not given enough detail to work with but you have given the name Optimize tool so i did some search and found this on Autodesk's site

The ProOptimizer feature is an optimization tool that helps you reduce the number of vertices (and so the number of faces) in an object while preserving the object's appearance.

so that can be done using a modifier in blender which is not an addon and is available by default known as a Decimate modifier that reduce geometry and tries to preserve geometry
Some example
This is a 24 thousand vertices cube

This is the same cube after decimating